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The basic principle states that a rock on a moraine originated from underneath the glacier, where it was plucked and then transported subglacially.
This long period of applicability is an added advantage of cosmogenic nuclide dating.
Sampling strategy is the most important factor in generating a reliable exposure age.
Several factors can affect cosmogenic nuclide dating: rock type, attenuation of cosmic rays, topographic shielding, post-depositional movement, and burial and cover by snow, vegetation or earth.
Many mountains have on them, and are smoothed and eroded below the trimline, and more weathered with more evidence of periglaciation above the trimline.
Trimlines can therefore also be used to reconstruct past ice sheet thickness.